Moderator

Did you read the clear examples in your book? A clear example here will NOT be any better.

If you follow the path the book shows, you may find it a little different from the one I showed. Either way, YOU will have to do it so you can SEE it and FEEL it and THINK about it. Calculus (and mathematics in general) is NOT a game that requires only the memorization of rules. You should be learning how to think.